Yarn js Package Manager – part 1

Yarn is a package manager for java Script. It is alternative to npm and bower. It is backward compatible to npm. Yarn has a great cache mechanism, so if dependency is requested more than once, after the first time, it will use cache and wont try to fetch information from the internet.

Yarn installation process is deterministic, you have the same structure of the node_module folder (the folder that contain all the installed yarn/npm js dependencies), will be the same on all machine regardless of the order of the package installations. In other word the order in which you install dependencies, wont affect the structure of the node_module folder.

In order to install yarn on your machine, follow the instruction according to your OS:
https://yarnpkg.com/en/docs/install

Once you finish, you can check it was installed successfully and its version by running:


oren@oren-computer:~/workspace/d3  
$ yarn --version
0.16.1

Once it is installed and all is well, we can create a new project by using init just like in npm:


oren@oren-computer:~/workspace/d3  
$ yarn init
yarn init v0.16.1
question name (d3): 
question version (1.0.0): 
question description: 
question entry point (index.js): 
question git repository: 
question author (Oren Tal <oren.tal2@gmail.com>): 
question license (ISC): 
success Saved package.json
Done in 4.23s.

Once you run yarn init, it will ask you a few question, then it will create the  package.json file.

If we want to install package, then we run the command:

yarn add <packageName>

For example to install d3:


oren@oren-computer:~/workspace/d3  
$ yarn add d3
yarn add v0.16.1
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Saved lockfile.
success Saved 39 new dependencies.
├─ commander@2.9.0
├─ d3-array@1.0.1
├─ d3-axis@1.0.3
├─ d3-brush@1.0.3
├─ d3-chord@1.0.2
├─ d3-collection@1.0.1
├─ d3-color@1.0.1
├─ d3-dispatch@1.0.1
├─ d3-drag@1.0.1
├─ d3-dsv@1.0.3
├─ d3-ease@1.0.1
├─ d3-force@1.0.3
├─ d3-format@1.0.2
├─ d3-geo@1.3.1
├─ d3-hierarchy@1.0.2
├─ d3-interpolate@1.1.1
│  └─ d3-color@1.0.2
├─ d3-path@1.0.2
├─ d3-polygon@1.0.1
├─ d3-quadtree@1.0.1
├─ d3-queue@3.0.3
├─ d3-random@1.0.1
├─ d3-request@1.0.2
├─ d3-scale@1.0.3
│  └─ d3-color@1.0.2
├─ d3-selection@1.0.2
├─ d3-shape@1.0.3
├─ d3-time-format@2.0.2
├─ d3-time@1.0.4
├─ d3-timer@1.0.3
├─ d3-transition@1.0.3
│  └─ d3-color@1.0.2
├─ d3-voronoi@1.1.0
├─ d3-zoom@1.0.3
├─ d3@4.3.0
├─ graceful-readlink@1.0.1
├─ iconv-lite@0.4.13
├─ rw@1.3.2
└─ xmlhttprequest@1.8.0
Done in 7.83s.

It will also update the package.json, so no need to use –save option.

If you already have a project with a package.json file, and want to install all the dependencies just run yarn install, like the below example:


oren@oren-computer:~/workspace/d3  
$ yarn install
yarn install v0.16.1
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Saved lockfile.
Done in 1.08s.

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